{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-28207", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-25T15:28:40.648Z", "datePublished": "2026-02-26T22:17:58.898Z", "dateUpdated": "2026-02-27T16:57:44.054Z"}, "containers": {"cna": {"title": "Zen-C Vulnerable to Command Injection via Malicious Output Filename", "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "lang": "en", "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 6.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/z-libs/Zen-C/security/advisories/GHSA-9rff-x96h-76h2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/z-libs/Zen-C/security/advisories/GHSA-9rff-x96h-76h2"}], "affected": [{"vendor": "z-libs", "product": "Zen-C", "versions": [{"version": "< 0.4.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-26T22:17:58.898Z"}, "descriptions": [{"lang": "en", "value": "Zen C is a systems programming language that compiles to human-readable GNU C/C11. Prior to version 0.4.2, a command injection vulnerability (CWE-78) in the Zen C compiler allows local attackers to execute arbitrary shell commands by providing a specially crafted output filename via the `-o` command-line argument. The vulnerability existed in the `main` application logic (specifically in `src/main.c`), where the compiler constructed a shell command string to invoke the backend C compiler. This command string was built by concatenating various arguments, including the user-controlled output filename, and was subsequently executed using the `system()` function. Because `system()` invokes a shell to parse and execute the command, shell metacharacters within the output filename were interpreted by the shell, leading to arbitrary command execution. An attacker who can influence the command-line arguments passed to the `zc` compiler (like through a build script or a CI/CD pipeline configuration) can execute arbitrary commands with the privileges of the user running the compiler. The vulnerability has been fixed in version 0.4.2 by removing `system()` calls, implementing `ArgList`, and internal argument handling. Users are advised to update to Zen C version v0.4.2 or later."}], "source": {"advisory": "GHSA-9rff-x96h-76h2", "discovery": "UNKNOWN"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-02-27T16:57:44.054Z"}, "references": [{"url": "https://f0nduesav0yarde.github.io/blog/vulnerabilities/cve-2026-28207/"}], "title": "CVE Program Container", "x_generator": {"engine": "ADPogram 0.0.1"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Zen C is a systems programming language that compiles to human-readable GNU C/C11. Prior to version 0.4.2, a command injection vulnerability (CWE-78) in the Zen C compiler allows local attackers to execute arbitrary shell commands by providing a specially crafted output filename via the `-o` command-line argument. The vulnerability existed in the `main` application logic (specifically in `src/main.c`), where the compiler constructed a shell command string to invoke the backend C compiler. This command string was built by concatenating various arguments, including the user-controlled output filename, and was subsequently executed using the `system()` function. Because `system()` invokes a shell to parse and execute the command, shell metacharacters within the output filename were interpreted by the shell, leading to arbitrary command execution. An attacker who can influence the command-line arguments passed to the `zc` compiler (like through a build script or a CI/CD pipeline configuration) can execute arbitrary commands with the privileges of the user running the compiler. The vulnerability has been fixed in version 0.4.2 by removing `system()` calls, implementing `ArgList`, and internal argument handling. Users are advised to update to Zen C version v0.4.2 or later."}, {"lang": "es", "value": "Zen C es un lenguaje de programaci\u00f3n de sistemas que compila a GNU C/C11 legible por humanos. Antes de la versi\u00f3n 0.4.2, una vulnerabilidad de inyecci\u00f3n de comandos (CWE-78) en el compilador Zen C permite a atacantes locales ejecutar comandos de shell arbitrarios proporcionando un nombre de archivo de salida especialmente dise\u00f1ado a trav\u00e9s del argumento de l\u00ednea de comandos '-o'. La vulnerabilidad exist\u00eda en la l\u00f3gica de la aplicaci\u00f3n 'main' (espec\u00edficamente en 'src/main.c'), donde el compilador constru\u00eda una cadena de comandos de shell para invocar al compilador C de backend. Esta cadena de comandos se constru\u00eda concatenando varios argumentos, incluyendo el nombre de archivo de salida controlado por el usuario, y posteriormente se ejecutaba usando la funci\u00f3n 'system()'. Debido a que 'system()' invoca un shell para analizar y ejecutar el comando, los metacaracteres de shell dentro del nombre de archivo de salida eran interpretados por el shell, lo que llevaba a la ejecuci\u00f3n arbitraria de comandos. Un atacante que puede influir en los argumentos de l\u00ednea de comandos pasados al compilador 'zc' (como a trav\u00e9s de un script de compilaci\u00f3n o una configuraci\u00f3n de pipeline de CI/CD) puede ejecutar comandos arbitrarios con los privilegios del usuario que ejecuta el compilador. La vulnerabilidad ha sido corregida en la versi\u00f3n 0.4.2 eliminando las llamadas a 'system()', implementando 'ArgList' y el manejo interno de argumentos. Se aconseja a los usuarios actualizar a la versi\u00f3n v0.4.2 de Zen C o posterior."}], "id": "CVE-2026-28207", "lastModified": "2026-02-27T17:16:33.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 6.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-02-26T23:16:35.277", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/z-libs/Zen-C/security/advisories/GHSA-9rff-x96h-76h2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://f0nduesav0yarde.github.io/blog/vulnerabilities/cve-2026-28207/"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.4.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Zen-C", "source": "cna", "vendor": "z-libs"}, "product": "zen-c", "vendor": "z-libs"}], "created": "2026-02-27T09:03:56.442952+00:00", "updated": "2026-02-27T09:03:56.443027+00:00", "vendors": ["z-libs", "z-libs$PRODUCT$zen-c"]}